diff options
Diffstat (limited to 'diff-lib.c')
| -rw-r--r-- | diff-lib.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/diff-lib.c b/diff-lib.c index a28dd3dca7..63da3b521d 100644 --- a/diff-lib.c +++ b/diff-lib.c @@ -131,3 +131,206 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed) return 0; } +/* + * diff-index + */ + +/* A file entry went away or appeared */ +static void diff_index_show_file(struct rev_info *revs, + const char *prefix, + struct cache_entry *ce, + unsigned char *sha1, unsigned int mode) +{ + diff_addremove(&revs->diffopt, prefix[0], ntohl(mode), + sha1, ce->name, NULL); +} + +static int get_stat_data(struct cache_entry *ce, + unsigned char **sha1p, + unsigned int *modep, + int cached, int match_missing) +{ + unsigned char *sha1 = ce->sha1; + unsigned int mode = ce->ce_mode; + + if (!cached) { + static unsigned char no_sha1[20]; + int changed; + struct stat st; + if (lstat(ce->name, &st) < 0) { + if (errno == ENOENT && match_missing) { + *sha1p = sha1; + *modep = mode; + return 0; + } + return -1; + } + changed = ce_match_stat(ce, &st, 0); + if (changed) { + mode = create_ce_mode(st.st_mode); + if (!trust_executable_bit && S_ISREG(st.st_mode)) + mode = ce->ce_mode; + sha1 = no_sha1; + } + } + + *sha1p = sha1; + *modep = mode; + return 0; +} + +static void show_new_file(struct rev_info *revs, + struct cache_entry *new, + int cached, int match_missing) +{ + unsigned char *sha1; + unsigned int mode; + + /* New file in the index: it might actually be different in + * the working copy. + */ + if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) + return; + + diff_index_show_file(revs, "+", new, sha1, mode); +} + +static int show_modified(struct rev_info *revs, + struct cache_entry *old, + struct cache_entry *new, + int report_missing, + int cached, int match_missing) +{ + unsigned int mode, oldmode; + unsigned char *sha1; + + if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) { + if (report_missing) + diff_index_show_file(revs, "-", old, + old->sha1, old->ce_mode); + return -1; + } + + oldmode = old->ce_mode; + if (mode == oldmode && !memcmp(sha1, old->sha1, 20) && + !revs->diffopt.find_copies_harder) + return 0; + + mode = ntohl(mode); + oldmode = ntohl(oldmode); + + diff_change(&revs->diffopt, oldmode, mode, + old->sha1, sha1, old->name, NULL); + return 0; +} + +static int diff_cache(struct rev_info *revs, + struct cache_entry **ac, int entries, + const char **pathspec, + int cached, int match_missing) +{ + while (entries) { + struct cache_entry *ce = *ac; + int same = (entries > 1) && ce_same_name(ce, ac[1]); + + if (!ce_path_match(ce, pathspec)) + goto skip_entry; + + switch (ce_stage(ce)) { + case 0: + /* No stage 1 entry? That means it's a new file */ + if (!same) { + show_new_file(revs, ce, cached, match_missing); + break; + } + /* Show difference between old and new */ + show_modified(revs,ac[1], ce, 1, + cached, match_missing); + break; + case 1: + /* No stage 3 (merge) entry? + * That means it's been deleted. + */ + if (!same) { + diff_index_show_file(revs, "-", ce, + ce->sha1, ce->ce_mode); + break; + } + /* We come here with ce pointing at stage 1 + * (original tree) and ac[1] pointing at stage + * 3 (unmerged). show-modified with + * report-missing set to false does not say the + * file is deleted but reports true if work + * tree does not have it, in which case we + * fall through to report the unmerged state. + * Otherwise, we show the differences between + * the original tree and the work tree. + */ + if (!cached && + !show_modified(revs, ce, ac[1], 0, + cached, match_missing)) + break; + /* fallthru */ + case 3: + diff_unmerge(&revs->diffopt, ce->name); + break; + + default: + die("impossible cache entry stage"); + } + +skip_entry: + /* + * Ignore all the different stages for this file, + * we've handled the relevant cases now. + */ + do { + ac++; + entries--; + } while (entries && ce_same_name(ce, ac[0])); + } + return 0; +} + +/* + * This turns all merge entries into "stage 3". That guarantees that + * when we read in the new tree (into "stage 1"), we won't lose sight + * of the fact that we had unmerged entries. + */ +static void mark_merge_entries(void) +{ + int i; + for (i = 0; i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + if (!ce_stage(ce)) + continue; + ce->ce_flags |= htons(CE_STAGEMASK); + } +} + +int run_diff_index(struct rev_info *revs, int cached, int match_missing) +{ + int ret; + struct object *ent; + struct tree *tree; + const char *tree_name; + + if (read_cache() < 0) { + perror("read_cache"); + return -1; + } + mark_merge_entries(); + + ent = revs->pending_objects->item; + tree_name = revs->pending_objects->name; + tree = parse_tree_indirect(ent->sha1); + if (!tree) + return error("bad tree object %s", tree_name); + if (read_tree(tree, 1, revs->prune_data)) + return error("unable to read tree object %s", tree_name); + ret = diff_cache(revs, active_cache, active_nr, revs->prune_data, + cached, match_missing); + diffcore_std(&revs->diffopt); + diff_flush(&revs->diffopt); + return ret; +} |